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It is not possible to upload images to Firebase without an internet connection. Firebase relies on the internet to transfer data between the local device and the Firebase backend servers. However, you can implement the ability to save the images locally on the device and then upload them to Firebase once an internet connection is available. This can be done using a variety of techniques, such as caching the images or storing them in a local database. Once the device regains an internet connection, the cached images or data can be synchronized with the Firebase backend.